function block(){
	var a = document.getElementById("bottom");
	a.style.display="block";
	var b = document.getElementById("Page");
	b.style.height="100vh";
	b.style.overflow="hidden";
}
function hindden(){
	var a = document.getElementById("bottom");
	var b = document.getElementById("Page");
	a.style.display="none";
	b.style.overflow="auto";
}
